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If vec(a) = hat(i) - hat(j) + 7 hat(k) a...

If `vec(a) = hat(i) - hat(j) + 7 hat(k) and vec(b) = 5 hat(i) - hat(j) + lambda hat(k), "then" vec(a) + vec(b) and vec(a) - vec(b)` are perpendicular vectors when `lambda` is

A

`lambda = +- 2`

B

`lambda = +- 3`

C

`lambda = +- 4`

D

`lambda = +- 5`

Text Solution

Verified by Experts

The correct Answer is:
D
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